Ps 56:8

“But the patience of good men with preparation of heart accepts the will of God: and glories in tribulations, saying that which follows: "Prepared is my heart, O God, I will sing and play" [Psalm 57:8]. What has he done to me? He has prepared a pit, my heart is prepared. He has prepared pit to deceive, shall I not prepare heart to suffer? He has prepared pit to oppress, shall I not prepare heart to endure? Therefore he shall fall into it, but I will sing and play. Hear the heart prepared in an Apostle, because he has imitated his Lord: "We glory," he says, "in tribulations: because tribulation works patience: patience probation, probation hope, but hope makes not ashamed: because the love of God is shed abroad in our hearts through the Holy Spirit, which has been given to us." [Romans 5:3] He was in oppressions, in chains, in prisons, in stripes, in hunger and thirst, in cold and nakedness, [2 Corinthians 11:27] in every wasting of toils and pains, and he was saying, "We glory in tribulations." Whence, but that prepared was his heart? Therefore he was singing and playing.”